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Finding the Fourth Proportional to 13,885.79, 20,804.42 and 11,560.74

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Solution

The fourth proportional to 13,885.79, 20,804.42 and 11,560.74 is: 17,320.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,885.79 : 20,804.42 = 11,560.74 : x
  2. Step 2: Convert to fraction form
    13,885.79/20,804.42 = 11,560.74/x
  3. Step 3: Cross multiply
    13,885.79x = 20,804.42 × 11,560.74
  4. Step 4: Simplify right side
    13,885.79x = 240,514,490.47
  5. Step 5: Solve for x
    x = 240,514,490.47/13,885.79
  6. Step 6: Final answer
    x = 17,320.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.